题目链接: 传送门 Minimum Inversion Number Time Limit: 1000MS Memory Limit: 32768 K Description The inversion number of a given number sequence a1, a2, ..., an is the number of pairs (ai, aj) that satisfy i < j and ai > aj. For a given sequence of numbe…
Minimum Inversion Number Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 17737 Accepted Submission(s): 10763 Problem Description The inversion number of a given number sequence a1, a2, ...,…
Problem 1050: Just Go Time Limits: 3000 MS Memory Limits: 65536 KB 64-bit interger IO format: %lld Java class name: Main Description There is a river, which contains n stones from left to right. These stones are magic, each one has a magic nu…
Stars Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 37323 Accepted: 16278 Description Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the level of a star b…
题意:对于两个区间,[si,ei] 和 [sj,ej],若 si <= sj and ei >= ej and ei - si > ej - sj 则说明区间 [si,ei] 比 [sj,ej] 强.对于每个区间,求出比它强的区间的个数. 解题思路:先将每个区间按 e 降序排列,在按 s 升序排列.则对于每个区间而言,比它强的区间的区间一定位于它的前面. 利用数状数组求每个区间[si,ei]前面 满足条件的区间[sj,ej]个数(条件:ej<=ei),再减去前面的和它相同的区间的个…